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FIFO_LRU.c
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FIFO_LRU.c
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#include<stdio.h>
int Hit(int data, int f, int frame[]){
int hit=0;
for(int j=0; j<f; j++)
{
if(frame[j]==data)
{
hit=1;
break;
}
}
return hit;
}
int start(int frame[], int f){
for (int i=0;i<f;i++)
frame[i]=-1;
}
void disp(int frame[], int f){
for (int i=0;i<f;i++)
if (frame[i]!=-1)
printf(" %d", frame[i]);
}
int main(){
int f, n;
printf("Enter length of reference string: ");
scanf("%d", &n);
printf("Enter frame size: ");
scanf("%d", &f);
int ref[n], frame[f], pagefault=0, pagehit=0;
printf("Enter the page reference sequence: ");
for(int i=0; i<n; i++)
scanf("%d",&ref[i]);
printf("\n*********FIFO Algorithm*********\n");
start(frame, f);
for(int i=0; i<n; i++){
printf("\n%d |",ref[i]);
if(Hit(ref[i],f,frame)==0){
int k;
for(k=0; k<f-1; k++)
frame[k]=frame[k+1];
frame[k]=ref[i];
pagefault++;
disp(frame,f);
}
else{
printf("Hit");
pagehit++;}
}
printf("\nPage Faults: %d\nPage Hits: %d",pagefault,pagehit);
printf("\n*********LRU Algorithm*********\n");
start(frame, f);
pagefault=0;
pagehit=0;
int least[50],j;
for(int i=0; i<n; i++) {
printf("\n%d |",ref[i]);
if(Hit(ref[i],f,frame)==0){
for(j=0; j<f; j++){
int pg=frame[j];
int found=0;
for(int k=i-1; k>=0; k--){
if(pg==ref[k]){
least[j]=k;
found=1;
break;
}
else
found=0;
}
if(!found)
least[j]=-1;
}
int min=10000;
int repindex;
for(j=0; j<f; j++)
{
if(least[j]<min)
{
min=least[j];
repindex=j;
}
}
frame[repindex]=ref[i];
pagefault++;
disp(frame,f);
}
else{
printf("Hit");
pagehit++;
}
}
printf("\nPage Faults: %d\nPage Hits: %d",pagefault,pagehit);
getch();
return 0;
}